1. Which is an example of file name of a C++ source file? A. sample.cs B. sample.cpp C. sample.obj D. sample.com E. sample.exe 2. Given the following code segment, what does 0 mean? int main() { // return 0; } A. it does not have any meaning B. the end of the "main()" function C. pause the execution and wait for further instruction D. the end of the code E. execute normally or successfully 3. Given the following code segment, what does #include do in C++? #include A. It instructs the compiler to create a new file named "iostream.cpp". B. It specifies to replace the keyword "iostream" with "include" in the current source file. C. It specifies to replace the keyword "include" with "iostream" in the current source file. D. It imports the "iostream" source file into current source file at the line immediately. E. It exports the current source file to the "iostream" source file